The KAK K-SPEC BCG combines multiple key features focused on increasing the reliability of your AR15 style firearm in 7.62x39 caliber with NP3 Tigry finish. This truly plug and play BCG accommodates whatever configuration your mission requires.KAK K-SPEC M16 Profile Bolt Carrier Group7.62x39 caliber compatibilityNP3 Tigry finish for enhanced durabilityDual ejectors for enhanced reliabilityAngled carrier rail cuts for flawless function in adverse conditionsDownward gas ports to reduce gas blowback to shooterFull auto profile designOptimized for both suppressed and unsuppressed usePermatex added between gas key and carrier mating surfaceDesigned to function reliably in the toughest conditions and prolonged suppressed use this BCG delivers consistent performance whether running suppressed or unsuppressed configurations.